Custom REST API to Get User Meta Value

Hello all. I’m trying to get the value of one user meta field. What am I doing wrong please?

add_action( 'rest_api_init', function() {
register_rest_route( 'wp/v2', '/get-my-celd/', array(
'methods' => 'GET',
'callback' => 'add_celd'
) );
} );

function get_celd( $content ) {
    $sql = mysqli_query($wpdb, "SELECT * FROM users ORDER BY ID DESC LIMIT 1") or die(mysqli_error($wpdb));
    if(mysqli_num_rows($sql) > 0){
        while( $row = mysqli_fetch_assoc($sql)){
             $id = $row['id'];
            }
            $celd_var = get_user_meta( 2, '_celd_meta', true );
            
            if(empty($celd_var)){
                return $content;
            
            
            $celd_var_string = '<em>User Wallet is: ' . $celd_var . '</em><hr>';
            return $celd_var_string . $content; 
            $myJSON = json_encode($celd_var_string.$content);
            echo $myJSON;
        }
    }
}
    
add_filter('my_celd', 'get_celd' );

• This topic was modified 2 years, 7 months ago by Jan Dembowski. Reason: Moved to Developing with WordPress, this is not an Everything else WordPress topic